Most surviving TR-1s no longer work. Many collectors (such as myself) prefer to keep them in `as-manufactured` condition. That way the authenticity is preserved. But at some point, you may be anxious to hear one play. Before you start soldering, ask one question - DO I REALLY WANT TO DO THIS Once it`s changed, it`s no longer original, and you may end up
Click here to download the full size of the above Circuit.
with a "modified" radio, and still have one that doesn`t work! NOTE - I`m presenting the information below to document what I did. Unfortunately I`m really not in a position to fix radios belonging to others. There are people who do specialize in fixing "antique" and collector radios and you should be able to track some down on the web or in newsgroups. But unless you have significant experience with electronics repair, I would think carefully about doing it yourself. When I bought my ivory TR-1, I discovered that it had been modified. So I figured, "well, it`s not authentic anymore anyway, so now I`ve got my `experimenter` radio". The first clue was when I spotted a replacement oscillator/converter transistor, X1. The "new" one was a GE 2N168A, which dates back pretty far. It "wiggled" when I touched it - a bad sign, indicating the foil PC board trace into which it was soldered was probably pulled away from the board. This happens when too much heat is used in soldering. I was going to need good documentation of how the radio should appear, where the parts go, and suggested schemes for doing the repair. Here`s what I used (if you need higher resolution jpg files of these, let me know): 6. Unsolder (go easy with this) tabs 3 and 4. Pull the board away from the chassis as you do this, but be careful with the fine antenna wire that should remain attached. 7. Pull the chassis and PC board apart. The antenna wire and the volume...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: